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dual flush

A dual-flush toilet is a variation of the flush toilet that uses two buttons or a handle mechanism to flush different amounts of water. A lesser amount of water is designed to flush liquid waste and the larger quantity of water designed to flush solid waste.
The system was developed by Japanese sanitary product manufacturer TOTO in 1960. It was equipped with two levers and built-in hand-washer, and was also revolutionary in that it reused the water in the hand-washer for flushing. However, it was not well known outside, or even within, Japan. In 1976, American industrial designer Victor Papanek proposed the dual flush system in his book Design for the real world, but the first practical implementation was designed in 1980, by staff at the Australian sanitary-ware company Caroma, with flush volumes of 11 and 5.5 litres. The design caught on, and a redesign in 1994 cut water usage to 6 and 3 litres.The dual-flush toilet has become almost universally adopted in Australia, New Zealand, Singapore, and Israel, with its use in new buildings often mandated by legislation in those countries. The more complex dual-flush mechanism is more expensive than many other types of low-flush toilets.

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  1. M

    Vitra dual flush running constantly....Help?

    Hi, Can anyone advise me on how to stop my dual-flush Vitra toilet running constantly? Firstly, how do I open the cistern lid? The toilet was fitted in our new house in late 2007. Any help greatly appreciated. I have isolated the in-line valve & flushed the cistern.
  2. T

    Dual flush fill valve not flowing properly?

    Hey I'm quite new to the plumbing world (clearly!) and I only had a moment where I could look at a mates fill valve for him but when it's filling its only finley spraying out and obviously takes ages to fill, took the diaphragm out and looked all well, took it out a few times and got it to run...
  3. W

    Anyone tried new Fluidmaster cable dual flush valve?

    Don't know how it's different, just noticed a new one is out. Swear by this valve so I'm hoping it's still the business as I imagine the old will be phased out.
  4. G

    Dual flush cistern lid

    This toilet is 5 years old and has suddenly started to fill very slowly after using either button. Thought I would have a peek inside to see if I could replace the valve. However, the ceramic lid is not visibly fastened, it will move a cm horizontally but will not lift vertically at all...
  5. B

    Dual Flush cistern

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  6. T

    Dual flush problem – RAK

    Hello, I'm hoping somebody can give me some advice on how I might fix a dual-flush cistern problem I've got... We've got two RAK Metropolitan toilets, both suffering the same problem. Press the dual-flush button and the toilet flushes, but 9 out of 10 times you have to repress the button to...
  7. A

    Dual flush toilet keeps filling

    Hi we have an old dual flush toilet which keeps filling. When you flush the loo the water empties from the cistern then stops running but comes out again as the cistern doesn't stop filling up when the ball cock rises. We have taken out the middle bit and looked at the seal but can't seem to...
  8. K

    Dual flush integral overflow problem

    My 5 year old Roca Dama dual flush toilet has developed an intermittent overflow leak. The overflow is integral in the siphon bit and goes straight down the waste (ie no overflow pipe). As I say it doesn’t leak every time but needs fixing as when it does there’s a steady water leak and dripping...
  9. G

    Dual flush toilet problem

    Hi I know very little about plumbing so could really do with some expert advice please. I have an ideal standard dual flush toilet. The half-flush button has just completely stopped working, whilst the full-flush button works perfectly! I have removed the cistern cover but am now stumped...
    • gileshall
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    • button cistern dual dual flush flush flushing mechanism oil problem toilet
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    • Forum: Plumbing Jobs | The Job-board
  10. P

    Dual flush button sticking

    I have had this problem awhile now and tried wd40 and seemed to work for a bit. When you flush the big button on the dual flush It sometimes stays down so water trickles in all the time until you give it another tap and it comes back to the top positon. How can I stop it doing this or do I need...
  11. A

    Constantly refilling dual flush valve cistern

    I have a 6 year old dual flush valve cistern (Space Suite) that is constantly refilling and discharging into the pan. Access is very tight and I am wondering whether this can be remedied through adjustments or whether a replacement washer is required?
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  12. E

    Dual Flush Toilet - tank wont fill at all unless wobble lid (intermittent problem)

    Can I anyone help - I have a dual flush toilet and the tank wont fill unless my wife(!) wobbles the lid, and then it refills slowly wth a high pitched whine. The missus always claims I push the button wrong - but in truth the problem just seems to get worse :) Any advice very welcome!
  13. P

    Ideal Standard Alto dual flush cistern query

    Good morning all - This is my first post on here and as a complete novice to plumbing matters, please bear with me for any ignorance! :-) I've had a couple of new loos fitted in our house which are both Ideal Standard Alto dual flushes and I'm not convinced that the dual flushing is working...
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  14. S

    dual flush

    hi guys got a problem with a dual flush valve, the flush isnt good enough to take away waste, or even just abit of toilet paper, there is defo not a blockage of partial block as ive rodded through the branch access and plunged the pan. i suspect new flush valve is this right???
  15. D

    Idela Standard Dual Flush - doesn't very well

    Hi - about 2 years ago we had a new bathroom refitted & the plumber installed one of these. There seems to be little difference between the full & short flush. In addition this does not usually clear all the toilet paper, even if it's a single sheet. So you press the button again & possibly...
  16. A

    problem flushing ideal standard dual flush (full flush)

    Hello all, I've recently encountered a problem with a customers dual flush system. Its ideal standard, has a chrome flush plate with two buttons, large (full flush) and slightly smaller (half flush) The customer has two toilets within the property and both full flush systems are not operating...
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  17. GQuigley67

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    need to replace this dual flush as it is broken, when i say imperial that is the manufacturer. but can't seem to find it anywhere on google or anything, the hole on the cistern lid isnt a circle its a rectangle, any help would be much appreciated thanks.
  18. M

    Problem filling tank on a dual flush toilet

    Hi, I hope somebody can help. Sorry, I dont really know anything in this subject before I carry on. My toilet suddenly takes forever to fill up. It's as though the pressure has dropped right off. When I took the lid of, the tap bit where the water should come out is letting water out but its...
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  19. N

    push button Dual flush valve

    My old siamp flush valve has had its day. Can anyone recommend a good dual flush valve. I've seen the Wirquin one in b&q and the fluidmaster in screwfix, Which is better? Thanks in advance
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  20. J

    Help Please - Very stiff dual flush plunger

    Hi. I'm hoping someone can help - I'm not a professional, and so may need one, but am hoping this is a simple problem and can be fixed easily. I have installed a cloakroom quite (sink & toilet) and the toilet has a dual flush plunger (rather than a handle) which is connected to the flush...
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